I am wondering the same.
On my RIMS, with a very coarse grind, a similar hochkurz step mash consistently results in about a 5% (roughly) increase in extract efficiency over a simple infusion - both leveraging a mash out step at 170F. I speculated in a different post that perhaps simply the length of the mash (~75 minutes infusion with mashout vs ~120 minutes step mashing to mash out) may have more completely hydrated the starches for conversion. I use identical crush settings for both infusion and stepped mashes, and both will feature a fairly fast circulation of the wort through the grain bed.
I have not done triple blind tastings to confirm any of this relative to flavor, mouthfeel or head retention issues.